I found another new feature in FW v.3 - something we've been asking them for over the last year - and although it's a baby step by Rigol, at least it's a baby step in the right direction:
The External Trigger input can now (finally) be used for a second trigger type: PULSE
- how would you wire this up to demonstrate this?
This would help explain Teneyes' earlier discovery that the Ext. Trigger can now be used as a source for the counter: it seems to go hand-in-hand with adding pulse measuring capabilities.
- how would you wire this up to demonstrate this?
An encouraging sign... let's hope they keep adding more triggers it can be used as a source for.
the Ext. Trigger can now be used as a source for the counter:
- how would you wire this up to demonstrate this?
Teneyes, can you show us the same test using square waves, say from a synchronous binary counter chip? If there is a difference there, that would be serious.
It would mean something is way wrong. With a sinewave input maybe there is some phase shift in the external analog circuit, but inputting two square waves with known identical corresponding transitions every 4 cycles, only different in frequency, it is a very easy test to reproduce, and if an anomaly shows up, then yeah, theres problems alright.
Teneyes, can you show us the same test using square waves, say from a synchronous binary counter chip? If there is a difference there, that would be serious.
also I see jitter of 500nS if I trigger externally.
I see jitter on a weak signal. < 280mVpp
What was the amplitude of the signal in your test?
I tested with Sin Wave 100mV RMS, and with Sq wave 1Vpp. I did not see any difference in the jitter.was the Sq.wave above and below 0.0 Vdc ,
What version of FW??
Note that there appears to be about a 9ns offset between the "EDGE" External Trigger point and the CH1 trace.
I can confirm the delay of 9nS, also I see jitter of 500nS if I trigger externally.
Symetrically at 0Volts, so -500..+500mv
FW is 3.00.01.03
Note that there appears to be about a 9ns offset between the "EDGE" External Trigger point and the CH1 trace.
The offset I get with a 0V External Trigger level is ~5-6ns (see image #1 - it varies a bit based on input voltage level). But since the External Trigger is a different signal path from the channel inputs, I would expect some difference. Of course, the offset changes based on the trigger level set: note the 3 images with a 0, 500mv, and 750mV trigger level. At 500mv (with 2V pk-to-pk square wave input simultaneously to CH1 and EXT) there is zero offset.
It appears the optimal setting for an External Trigger (assuming you want as little offset as possible) is between ~1/4 to 2/3 (with 1/2 between the average) of the respective-going voltage (i.e. for falling/negative edges/pulses ~half of the negative voltage - for rising/positive edges/pulses ~half of the positive voltage).I can confirm the delay of 9nS, also I see jitter of 500nS if I trigger externally.
Symetrically at 0Volts, so -500..+500mv
FW is 3.00.01.03
+500mV/-500mV square wave - virtually zero jitter (and no offset with trigger level set to 250mV). Check animated GIF of captured segments.
Nice animated JPEG ! almost a real scope on your desktop
However I can see horizontal jitter, if you look closely, you can spot it. It is even better viewable with a fast risetime signal, and on 2nS/div....
We are talking about 500pSec. This dissapears if you change the trigger from ext to ch1 (at least on mine)
Has anyone determined the better of the two latest firmwares for the DS2000 series yet? FW v2.xxxx or v3.xxxxx?
I just bought a DS2202 non A version and have the desire to unlock all the options but want to make sure I have the better (less buggy) of the firmwares in place first.
marmad,
Thank you, I took the plunge and performed the v3 update.. guess we shall see.. .. Thank you.
so far, so good!
what a great piece of equipment for the money, very impressive!
JLM
If Rigol made a DS2074 version of this scope, it would be perfection.
If Rigol made a DS2074 version of this scope, it would be perfection.
Even a higher level of perfection would be a DS2304 with room to grow!..A few members here have 2 Rigols and connect trig out/in.
Maybe it's called the 'Combo DS1/2306'
I don't think it's a good idea.
As I wrote here, Trig Out signal from DS2072 has very bad jitter.
It seems, that Trig Out of 2072a is not hardware, but a kind of software (from FPGA logic) and it is suitable for low frequencies only, not higher than 1MHz I think.
Indeed i have, thats why i was looking at the ds1000, connected to a ds2000..!!, 6 channel DSO with lots of different timebases.
@Wim13 - Which reminds me - what is the situation with the Trigger Out on the DS1000Z series? Less delay and/or jitter?
If you want both scopes together to act as a 6 channnel scope the delay can be corrected for, but the jitter means that for frequencies > say 1 MHz the jitter becomes annoying....